The term "load on top" is used on many crude oil carriers, is to provide a method for （）.<br>A:calculating the ullage in the cargo tanks<br>B:loading ballast by gravity<br>C:the loading of new cargo into the slop tank as a procedure to minimize pollution<br>D:calculating the ratio of cargo expansion in a cargo tank

The term "load on top" is used on many crude oil carriers, is to provide a method for （）.
A:calculating the ullage in the cargo tanks
B:loading ballast by gravity
C:the loading of new cargo into the slop tank as a procedure to minimize pollution
D:calculating the ratio of cargo expansion in a cargo tank

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